Electric hoist



May 22, 1928.

G. E. MOORE ELECTRIC HOIST Filed Oct. 1, 1924 '7 Sheets- Sheet 1 (for aMay 22, 1928. 1,670,734

- G. E. MOORE ELECTRIC HOIST Filed Oct. 1, 1924 '7 Sheets-Sheet 2 hwemm'E ficorgeildmqrnoom 9M a."

May 22, 1928. 1,670,734 G. E. MOORE ELECTRIC HOIVST Filed 001:. l, 1924'7 Sheets-Sheet 3 May 22, 1928. 1,670,734

, G. E. MOORE ELECTRIC HOIST I Filed Oct. 1, 1924 '7 Sheets-Sheet 4 1mmMok" GaorgcEwm- Moore May 22. 1928.

G. E. MOORE ELECTRIC HOIS'I.

7 Sheets-Sheet 5 Filed Oct. 1, 1924 vw mm mm. 0Q mwf 6 J Wu B L l May22, 1928.

G. E. MOORE ELECTRIC HOIS'I 7 Sheets-Sheet 6 Filed 001.. 1, 1924yiokzf/m May 22, 1928. 1,670,734

G. E. MOORE v v ELECTRIC HOIS '1 Filed bet. 1, 1924 v 7 Sheets-Sheet 7Patented May 22, 1928.

UNITED STATES PATENT OFFICE.

GEORGE EDWARD MOORE, 0F 'MUSKEGON, MICHIGAN, ASSIGNOR '1'0 MANNING, max-WELL & MOORE, INC OF NEW Y ORK N'. Y., A CORPORATION OF, NEW JERSEY.

ELECTRIC HOIST.

Application filed October 1, 1924. Serial No. 741,098.

This invention relates to an electric hoist, of the type WhlCh may beeither attached to an overhead beam or other support or equipped with atrolley to run on the lower flanges of an I-beam, or similar support.

In hoists of this character, it is an accepted feature of their designthat they must occupy as little height as possible and, for service,under the conditions to which they are subjected it is desirable thatthe diameter of the hoisting drum over which the hoisting ropes orcables are wound should be at least twenty-four to thirty times thediameter of the cable. Also the hoist should be as compact as possibleand at the same time the parts thereof be readily, accessible forinspection or repair. Hoists have been made in which the drum over whichthe cables are wound is in alinement with the motor and a gear reductionbox is located adjacent the end of the drum away from the motor and,while this construction reduces the height of the hoist, it results inan abice, extremely high strains in the parts sothat gears and shaftsmust be made of high priced alloy steels, specially heat treated, in

order: to enable them to stand up when in and the constructionsembodying the same occurring in the rope or cablebythe short bendingmade by a smalhdiameter' drum. Still others-make a drum of short lengthand coil the rope or cable in overlapping coils on the drum. This isvery objectionable as ropes or cables subject to tension are easilyweakened on account of the stresses set up when so wound on the drum.

equipped with a brake of some sort to control the rotation of the drumand this brake should be subject to control at a distance from thehoist.

It is a primary object and purpose of the present invention to provide anovel construction and design of hoist operated by an electricmotor-wherein minimum height, the most compact. assembly of partspossible, a drum of proper diameter with respect'to the rope or cableused thereon, machinery easily accessible for inspection or repair, anovel form of brake control for-the hoist and one readily controlled ata distance from the hoist, and a hoist which is capable of manufacturein any of the various sizes desired from smallest to largest with nochanges except dimensional changes for I the different sizes isproduced; and this 1n a practical and-economical manner 1113.0

cordance with the best of engineering prac-' tice, with gears and shaftsand other parts made of ordinary commercial forged and cast steels notrequiring any special highpriced material or special treatment wherebythe cost of manufacture is increased or factors are introduced which, ifnot correct-in all respects, are a source of weakness rather thanstrength in the design. It has been the controlling thought in theconstruction of this. electric hoist to produce one which in itssimplicity and soundness of design is as 262111" perfect as possible anda classic in its For an understanding of the invention reference may behad to the following description taken in conjunction with the ac- Ilooking at the right hand end of the same as it appears in Fig. 3. I

.Fig. 5 is a vertical section on the plane of line 5-5 of Fig. 3.

Fig. 61. is an end elevation with parts hoist, and

of construction wherein a chain is used in' place of a rope or cable.

Fig. 10 is a vertical section on the plane of line 10-10 of Fig. 11.

Fig. 11 is a plan of the different form of Fig. 12 is an elevation ofthe different form of hoist similar to that shown in Fig. l of the firsthoist described.

Like reference character refer to like parts in the different figures ofthe drawings.

In the construction of this hoist, a main frame member is providedintegral with which is a gear box 1 from which a vertical web 2 extendsat right angles the same being reinforced by an upper flange 3 (see Fig.2) and a lower oppositely extending flange. 4, the web at its outer end.being formed, as shown in Fig. 3, and terminating in an end portion 5which is positioned vertically and in substantial parallelism with thesides of the gear box. The gear box 1 is open at its under side butextends down far enough that bearings for the various shafts on whichthe gearing and the drum are mounted are provided above the'lower edgesof the gear box, this being best shown in Fig. 6. A bearlng 6 is formedat the edge of the end portion 5, a rod or shaft 7 on which the groovedhoist-- ing drum 8 is mounted passing through the bearing 6 and asuitable bearing 6 (see Fig. 3) in the gear box 1.: This rod or shaft isheld against rotation by a set screw 9 which passes through the bearing6 and at its end seats in a recess in the shaft as fully shown in Fig.3. This shaft is bored at each end for a distance to make a centralopening 10 from which a lateral branch 11 is made to the outside of theshaftand to the bushings 13 around the shaft, which are carried in thehubs 'at the ends of the cable drum 8. Any usual form of grease cup.12is screwed in each end of the shaft 7 so that thegrease may be forcedthrough the passages 10 and 11 to the bushings for proper lubrication.

It will be noted that the shaft 7 is a plain cylindrical rod and inpractice it is cut from the proper stock of cold rolled steel rod, re-

quiring no-outside machining.

At the end of the drum 8 within the gear box '1, a gear 14 is securedbeing keyed onto the end of the drum. An electric motor 15 is located onthe side of the'Web 2' opposite the drum 8 and is-secured by bolts 16,as shown. in Fig. 2, the drum and the motor being positioned as closelyto each other as possible with web 2 between. The front armature shaft17 of the motor extends through the adjacent side of thegear box and isequipped with a pinion 18 which in turn meshes with a somewhat largergear 19 keyed to an extension 20 of the hub of a pinion 21 which liesalongside of the gear 19, this extension of hub 20 of the pinion beingmounted on a bushing 22 around a shaft 23 passing through the oppositesides of the gear box. Asshown in Figs. 7 and 8, the inner end of therod or shaft 23 has a short key-way 24 cut therein into which a pin 25passes, the same extending upwardly from the lower edge of the lowerside of the gear box to the key-way slot 24. A cotter pin 26 is thenpassed through the projecting end of the shaft 23 whereby it is evidentthat this rod or shaft 23 can have no longitudinal movement. The outerfront end of the rod or shaft 23 is equipped with identically the samelubricating means heretofore described with reference to the shaft 7,that is, passages lO and 11 leading to the bushing 22' g and a greasecup 12 screwed into the rod or shaft 23. The pinion 21 meshes with agear 27 of substantially the same diameter as the gear 14 heretoforedescribed. Gear 27 is keyed to a projecting hub 28 extending from apinion 29 lying alongside the gear 27 and this pinion 29 with itsprojecting hub is mounted on a bushing 30 through which a shaft 31,similar in all respects to the shaft 23, extends. The pinion 29 mesheswith the gear 14:. There is thus provided a gear reduction between themotor and the drum 8. It will be noted that all ofthe gears, wit

the exception of the one on the armature shaft 17, are straight spurgears and thatall are equipped with bushings turning loose on the shafts23 and 31. The shafts are fixed and are subject to almost uniformallydistributed bending and shear strains only so that their diameter can beat a minimum. The keying of the gears onto extensions of the pinions ordrum is an advantage in that the diameter at which the key is placed islarge in comparison with what it would be if the gears and pinions werekeyed separatcly to their shafts, this reducing stress on the keys to acomparatively low figure. By this means the pinions can be made of theabsolute minimum diameter consistent with ample wearing area andstrength and it is evident that a minimum of space is taken up by thegearing as all of the gears and pinions are located closely together, asshown in Fig. 3, and no waste space appears. The

reductions are proportioned so as to occupy the minimum lengthconsistent with having the drum' as close to the motor as possible. thelocation of the first reduction back-of the motor pinion giving a greatlatitude in cheaper and better as the strength of a Sta-- tionary shaftis greater than that of a rotatmg shaft. The gear case 1 is equippedwith a lower cover'32 which may be detachably connected and held inplace by bolts 33. But two of these bolts are shown as they have only tocarry on the weight of the gear case cover 32. It is evident that thecover 'may be removed at any time and the hoist operated, this beingsometimes convenient during tests or to investigate any suspected faultsin the construction. Y

Two spaced apart bosses 34 are cast integral with the frame at the upperside thereof, as shown in Fig. 1, through which a rod 35 passes. Thisrod also passes through a sleeve 36 located between the bosses 34integral with which are opposite, outwardly and upwardly extending armsor ribs 37 connected b an integral web 38. At the upper ends of the ribs37 bearings are provided for the rigid mounting of shaft pins 39 whichextend upwardly and inwardly toward each other. Flanged rollers 40 arerotatably mounted on the free ends of the shaft pins and are adapted tobear against the upper sides of the lower flange of a horizontallymounted over head I-beam 41. This provides a trolley construction formounting the hoist for movement in a hori-' zontal plane along theI-beam support. The

' .rod 35 is located as closely as possible directly over the eenterofgravity of the hoist.

At the lower side of the frame and in. .front of the ledge or flange 4 abar .42 of metal is secured by bolts 43 to said flange.

This bar is of flat rolledv steel and is used.

instead of casting the same integral with the frame because of thesuperior reliabilit of rolled as against cast metal under higl bendingstresses and, further, because of the at its upper side by a guard 46 ofconventional construction to insure the cable staying on'the roller. Theropes or cables 47 used pass over the roller 45, the two strands thenpassing downwardly under two grooved pulleys 48 which are mounted on afixed shaft similarv in construction and mounting to the shafts 23 and31. This shaft is mounted at the upper end of a housing 49 from which ahook 5O depends. The strands of the cables 47 after passing under thepulleys 48 are thence carried upwardly to the drum- 8- and wound aroundthe same in the grooves shown as formed inthe drum. 'It is apparent thatthe windings of the cable or rope around the drum do not contact witheach other, the drum being of sufficient length to carry all windings ofthe rope for any vertical lifts for which the hoist may be designed.

The rear armature shaft extension 17 has a brake drum 51 keyed orotherwise secured thereto. A bracket 52 is permanently secured to theoff-set portion of the vertical web 2, shown in Fig. 3, by bolts andextends outwardly over the brake drum. At its end Two brake shoes 57 and58 are pivotally connected at their upper ends, at 59 and 60,

respectively, to the bracket 52 and pass downwardly at opposite sides ofthe drum 51. These shoes are lined with woven asbestos material,indicated at 61, which bears directly against the surface of the drum.At its lower end the shoe 58 is connected, at 62, to an'upwardly'extending lug formed on a horizontally positioned lever 63 which extendsto and-at one end is pivotally connected, at 64, to the plunger or core54. The lower end of the other shoe 57 is pivotally connected. at 65, toa member 66 which in turn is adjustably connected with a pin 67. whichis screwed into the member 66 at one end and pivotally connected by pin68, at its opposite end to the lever 63. It is evident that when nocurrent is passing through the motor and solenoid, the weight 55 servesto .draw lever 63 downwardly and tighten the linings of the brake shoesagainst thev drum therebyputting a check on its rotation; and when themdtor is started, with a coincident passageof the electric currentthrough the solenoid coil, plunger 54 being elevated releases thebrakeshoes from bear ing engagement with the drum 51. At the free end oflever 63 a rope 69 is attached whereby the brake may be operated1nanual- 1v from below the hoist whenever it is desired. Since the brakeshoes when released from thebrake drum are free to'swing in their uppersuspension pins 59 and 60, and one of the shoes might drag on the brakewhile the other opened .to' a greater extent than was needed,easilyadjustable stops 70 and 71 are connected to the' solenoid casingand the web, 2 respectively, as shown in Fig. 5, which prevent outwardmovement of either brake shoe beyond a predetermined point, said shoesbeing provided with reinforced ribs 58 having shoulders in directopposition to the stop members 70 and 71. This is desirable and in factnecessary in view of the fact that the length of the stroke of thesolenoid magnet is very limited and must be made the most of. As thebrake lining wears it'is clear that the plunger or core 54 will have .todescend lower in order that the shoes grip" the drum, this making itsstroke longer and the releasing pull of the solenoid when the currentisturned on initially weaker, requiringthat frequent adjustment of theshoes for wear be made.

With this brake the load suspended from the hook 50 is held againstmovement when the current is turned off and the motor stopped. The brakeis released when the current is turned on with either the hoistingrection with a suspended load carried on the.

hoist, there is nothing in this construction so far as described toprevent the load fromat once starting to fall with great rapidity. Andthis would, when the speed reached a certain point, act to destroy themotor due to centrifugal force on the armature coils. To give loweringcontrol and protection against excessive lowering speed a governor isused in conjunction with the brake. From the drum 51 two pins 72,-located diametrical- 1y opposite-each other on the drum, projectoutwardly onflwhich, beyond the drum, two governor shoes 73 arepivotally mounted being faced on their outer. sides by woven asbestosmaterial 74 and normally -drawn toward each other by a coiled spring 75,as shown in 1 Fig. 4. A stationary cylindrical housing 7 6 surrounds theshoes 73 and has an integral bracket extension 77 bolted securely to theweb 2 of the hoist frame so that the housing is held rigidly in relationto the frame of the hoist. This housing is provided with radiating finsfor the quick disposal of heat caused by friction of the brake shoesagainst its inner side.

The governor brake shoes with the spring connecting them provide a unitof a very simple construction which can be readily applied to the pins72 and which is very effective in action. The weight and location of thecenter of gravity of the shoes is accurately determined so as to be ableaccurately to figure the centrifugal force that each will have atdiil'erent speeds; and the spring is then so proportioned.that whenstretched to hold the two shoes together it the motor. 'However agreaterspecd will cause the shoes to move outwardly against thetension'of spring 75, flying out so as to bring the braking material 74against the inner sides of the housing 76 and thus put a dragon themotor armature which will prevent the speed thereof from beconiingexcessive; The manner in which the shoes are pivoted 'on'the brake drum51 and connected by a single spring makes it impossible for one shoe tohave a greater force against the housing 76 than the other, because, asthe shoes are duplicate and held back by the same force, the centrifugalforce in each available for braking must be the same.

shoes is sufficient to prevent the full load on the hoist from revolvingthe armature any faster, even if assisted by' the current in the motor.Thus the governor absolutely prevents even a momentary excess inlowering speed with possible damage to the motor. Two and one-half timesthe normal full load speed of themotor issubstantially the limit ofspeed which the motor armature will safely withstand and this may besafely permitted when the motor is direct current and series-wound, bothwhen elevating the hoist orwhen lowering any load. v

It will also be noted that when the gorernor shoes -.73 with theirlining 74 are bearing against the stationary housing 76, it forms inefi'ect a temporary third bearing for the armature shaft which has a.steadying effect and prevents vibration at high speed with consequentwear on the adjoining'r'notor bearing. It will also be noted that if thegovernor spring should gradually become weaker no detrimental effectwill be had, as this will only cause the governor to act earlier thanbefore and checkthe lowering speed sooner, while if the spring 75 shouldbreak, the governor shoes will begin to act at once as soon as the shaftbegins to j use 'two and one-half times the hoisting speed revolve,resulting in even greater safety as the maximum lowering speed would beconsiderably diminished with no possible harm resulting; and any suchdefectcan be detected practically instantly and a new spring installed.

By thus limiting the lowering speed to and equal to the non-loadhoisting speed which would be attempted with a direct series woundmotor, a large measure of-lowering control is secured. The operator withthis. hoist, to lower, moves the controller either to the full currentpoint on the rheostat, or at any one of the resistance points thereof,thereby releasing the magnetic brake and allowing the load to descend atwhatever speed it may attain. This speed will increase until' thecritical point is reached where it automatically comes under control ofthe governor, and beyond which speed it cannot go. The load is stoppedWithin an inch or two of the point It is desired to reach and thereafterlowering proceeds by series of momentary current impulses which movesthe hook a fraction of an inch at a time.

The hand control operation of the brake by means of the rope 69 is ofvalue where extreme delicacy of control in lowering is required andthis, in conjunction with the 'governor, permits the very nicestlowering control w1thout current on the motor. It is necessary howeverfrom the point of safety that the hoist be equipped with the governor asaninexperienced or careless operator, by'allowing the lowering speed tobecome excessive with a load, will destroy the motor armature, but evenif such operator should fail in properly hand controlling the brake thegovernor automatically stops the motor from runnin beyond apredetermined safe speed of su stantially ,two and one-half times itsnormal full load speed.

Therefore, with thisapparatus of extreme simplicity, the greatest nicetyof lowering control can be obtained merely by the attachment of adepending cord or rope; and without the attachment of this cord ameasure of lowering control sufficient for all but very exceptionablecircumstances is attained. At a considerable extra cost and with serious drawbacks the ordinary dynamic braking used many times with hoistsof this character could be usedwhich would give but slightly greatermeasure of lowering control than can be obtained by this structureWithout the rope or cord 69 but not nearly as great as can be obtainedwith it. This is a very important feature of the invention, on accountof its practical proved results, its extreme simplicity and economy inmanufacture.

The construction of hoist shown 1n Figs.

,l to inclusive gives all of the advantages and results set forth in thestatement of the invention made preliminary to the description of theconstruction. The frame, as a single casting, is readily produced andrequires but little machining. The construction is very compact, themotor and drum being located as closely as possible to each other andthe hoisting cables or ropes 47 depend from the drum on the side nearestthe vertical web 2 of the casting, passing over the block equipped withthe hook 50 and thence coming back over the roller 15 at a point distantfrom thecentcr of gravity of.

the hoist substantiallylequal to the distance of the cables 47 from saidcenter of gravity at the other side thereof. This balances the'construction. Assuranceis provided againstthe excessive speed in a verysimple and economical manner. are of a most economical form but arefully capable of withstandin all stresses to which they may be subjectein service. Every part of the machine is in accordance with the bestaccepted engineering practice. All parts are easily accessible forinspection and repair. And in every'way the construction is designed tocombine simplicity, economy and practicability. That this is so has beenextensively proved in actual practice.

In Figs. 9 to 12 inclusive, a different design of hoist is shown thoughit has all of the advantages of the one previously described withreference to Figs. 1 to 8 1nelusive. This'second hoist, instead of beingequipped with wire hoisting ropes or cables,

-uses ordinary crane chain for the yertical is flanged at its upper andlower sides and free end for. strength and reinforcement. In addition ahousing 78 is cast integral with the frame on the side thereof oppositewhere the motor 15 is connected. This housing covers an elongated sleeve80 mounted on suitablebushings on a shaft 81 which The gearing andshafts.

passes through the gear casing,- beingsupported thereby at one end andat;the oppositeend being supported in the 'end' of the housing 78. Agear 79 is fixed at one end of the sleeve 80 and, to all intentsandpurposes, is equivalent tothe gear 14: fastened on the end of the drum 8in the first described construction. It is one of the train of gearsinterposed between the motor 15 and the sleeve 80 fordrivingthe latterfrom the ,the chain thence passing upwardly and over the sprocket wheel82. The end of the chain after passing over sprocket wheel 82 is loopedback and the end link thereof is secured between two ears 85 extendingoutwardly from a block 87 which is positioned vertically and at itsupper end is mounted on a rod 87 passing throughbosses formed at theupper ends of spaced apart vertical webs 88 cast integral with the frameof the hoist under the housing 7 8, serving to reinforce the verticalweb 2 of the hoist frame against any eccentric stresses which may arisein service. An upper hook support 89 .is shown attached at the upperside of the vertical web'2, as near as possible over the center ofgravity of the hoist and practically directly over the'lower loadcarrying hook 50. Of course, this hoist could be made to traverse ahorizontal beam like the I-beam 41 quite as well as the first describedhoist,

- and such first hoist can be-equipped witha or attached hook like thatat 89 if it is not desired that the hoist shall-have horizontalmovement.

In this design of hoist, the solenoid magnet 53 is placed on the side ofthewebopposite to the side at which the motor is attached, there beingspace for its reception due to the elimination of the long drum. Thehousing 76 for the governor brake shoes is mounted directly opposite thesolenoid magnet, bein fixed to the web 2 near its outer end. he brakeshoes 57 and 58, instead of being suspended from an over head bracket asin the first described structure, are suspended from pins 59 and 60"which in turn are .connectedto the upper side of the housing 76 andextend inwardly toward the motor. The supports for the adjustable stopsand 71 are conveniently cast with to the relatively stationary motorhousing 76. Lever 63 connected at one end to the solenoid core orplunger 54 is similar in most respects to the lever 63.

It does not show an extension for the attachment of a' depending cord orrope for manual control of, the brake though it is obvious that thisextension and the cord attached thereto can be used if desired.

inforced by ribs such as indicated at 88,

this permitting the integral casting of the block or projection 83 towhich -the end link of the chain 84 is secured whereby the load reactsdirectly on the frame. The manner of attachinent ofthe chain, which isby re cessing the projecting block 83 to snugly aecommodate the end linkof the chain and a portion of the second link and attach the same by theplate shown which may be slotted to receive and accommodate the top ofthe second link, is of advantage because itenables the user to fit anewchain on his hoist without having to forge end links for connection.For different classes of service one of the hoists may be preferred overthe other the 1 chain type being useful where rough usage occurs whichwould be fatal to the much more delicate wire rope or cable. The chainhoist has a further advantage in that there is no space limit to thevertical lift, such lift being available to any height so long assuflicient chain is provided for it; while with the wire cable hoist thelimit of vertical lift is governed by the length and diameter of thedrum, this governing the amount of rope or cable that can be carried onthe drum.

The constructions described areboth very slmple, practical, durable andsizes. The invention is defined inthe claims and "is to be consideredas; comprehensive of all forms of structure coming within their} scope.

I claim: 1. In an,clectric hoist, asupporting frame lncluding a verticalWeb, an electriemotor located atone side and fixed to the web, ahoisting drum rotatably mounted at the opositeside of the Web on saidframe, gearing Between thcmot'or shaft-and drum for drivmg the drum at areduced specthhoisting ropes wound on the drum and depending therefrom,a pulley block-through which I efficient-.- 'The r productlon has beenthe result of an described hoist. The vertical web 2 is rethe ropespass, a pulley mounted at the lower.

part of said vertical web over which the rope. passes and a har fastened'to and paralleling the lower edgemf the web on which said pulley ismounted, substantially as described.

2. In an electric hoist, in combination, a supporting. frame includingan integrally cast gear box and a verticalweb extending to one sidethereof, an electric motor fixedto the web at one side and having itsarmature.

shaft extending into the gear box, a pair of shaftsvmounted in andextending between the sides of the gear box, means for holding saidshafts against rotative movement, one of said shafts being located atone side of the armature shaft and the other at the other side of saidshaft, a 'rotatably mounted hoisting member carried bythe web and outerside of the gear box on the side of the web opposite the motor, saidhoisting member having a gear at one end located within the gear box andextending toward the last mentioned shaft, and reduction gearinginterposed between the motor armature shaft and the gear on the hoistingmember for driving said hoisting member from the ehctric motor.

3. In an electric hoist, a frame including agear box and a vertical webextending therefrom, an electric motor fixed tofthe web at one sidethereof having one end of its armature shaft extended into the gear box,

' a pinion on the end of the armature shaft,

a shaft mounted on and extending between the sides of the gear box adistance from the armature shaft, a second pinion having an extended hubloosely mounted for rotation on the shaft, a gear keyed 'to said hubextension of the pinion andmeshing with the armature shaft pinion, asecond shaft at the opposite side of the motor armature shaft mounted onand extending between the sides of the gear box, a third pinion havingan extended sleeve rotatably mounted on the qsecond shaft, a large gearkeyed to said hub extension of the third pinion-meshing with the secondmentioned pinion, a rotatably mounted hoisting member carried by theframe-on the side of the web opposite the electric motor, and a gearsecured to the end of the hoisting member within the gear box said gearbeing inmesh with the third pinion, substantially as described.

4/111 an electric hoist, a frame comprising a verticah web and a gearbox integrally cast therewith at one end of the web, said motor mountedat one side and fixed to the gear box comprising inner and outer sidesspaced apart ,andconnected by an integral cross portion at their upperedges, the lower side of the gear box being open, an electric web, saidmotor having its armature shaft extending through the inner side of thegear inner side of the gear box and equipped box above the lower edge:thereof, a rotata- 'blymounted hoisting member located at the,

opposite side of the web said hoisting member 7 having one end passingthrough the with. a gear, a pinion on said end of the motor shaft, andreduction. gearing between said pinion and gear mounted on two-shaftscarried by the gear box, one at each side of the motor shaft, andadapted to connect said armature shaft pinion with the rotary hoistingmember gear, substantially as described,

boxineluding spaced apart sides and an integral bottom, complementarylugs cast on said clo-:ure member and the upper gear box,

and bolts passing through said lugs for detachably securing said undermember tothe gear box, substantially as described.

(5. In an electric hoist, a vertical web and a gear box cast integraltherewith at one end of the web, said gear box comprising spaced apartside: connected by an integral upper cross portion, the lower side ofsaid gear box beingopen, an electric motor attached to the web at oneside thereof having an armature shaft extending through the inner sideof the gear box, two short shafts one located at each side of thearmature shaft in substantially the same horizontal planev therwith, arotatably mounted hoisting member carried by the frame on the sidethereof opposite the'motor having one end extending into the gear box, agear fastened to said end of the hoisting member, means for holding saidshafts against rotary movement, and reduction gearing mounted on saidshafts and interposed between the gear on said hoisting member and thepinion on the armature shaft for driving the hoisting.

member from the motor, substantially as described.

7. In an electric hoist, a frame comprlsm a hollow gear 'box and avertical web pinion on said end of the motor shaft, a gear on said endofthe hoisting member, two stationary shafts located one at each side ofthe motor shaft extending between the sides of the gear box, a secondpinion loosely mounted on one shaft and inv engagement with the gear onthe hoisting member, said 'pinion having an extended hub, a second gearfixed to said hub of substantially the saine diameter as the gear on thehoisting member, a third pinion loosely mounted on theother shaft, andin engagement with the second gear, said third pinion having-anextending hub, and agear keyed to said last mentioned hub andinengagement with the pinion on the motor shaft, substantially asdescribed. I I

8.. In an electric hoist a frame comprising a hollow gear box and avertical web extending to one sideiherefrom, said fixed to andlocatedatone side of the web, a rotatably mounted hoisting memberlocated at theopposite side of the web, two shafts. extending between and passing arbox hav ,mg an open under slde', an e ectric motorshort keyway', a

through the sides of the gear box, each of said shafts at one end beingformed withva in extending upwardly from the lower e go of the gear boxinto said keyway, a pin assi ng through said end of the shaft outsice ofthe gear box, and gearing mounted on said shafts, on the motor shaft andon the hoisting member for driving the hoisting member from the motor atreduced speed, substantially as described. 9. In an electric hoist, anintegrally cast frame including a gear box and a vertical web extendingtherefrom, with upper and lower oppositely extending reinforcin zontalbar fastened to and at the edge of the lower flange, a rod passingthrough said lower flange and bar, a pulley mounted at the outer end ofthe rod, an electric motor fixed at one side of the web above saidpulley, a rotary hoisting member mounted at the opposite side of theweb, gearing located within the gear box between the motor and hoistingmember for driving the later by the former, a flexible cable bent overthe pulley, and a lifting block including two grooved wheels locatedunder the web, said flexible member passing under the grooved wheels andthence upwardlyv around the rotary hoisting member, substantially asdescribed.

In testimony whereof I aflix my signature;

GEORGE EDWARD MOORE.

